Piston-ring



F. HACHMANN.

PISTON RlNG.

APPLICATION FILED DEC. 5. I913- Patented Aug. 3, 1920.

j yaj 12 ,2 flue/Z2592? UNITED ST'ATES'PATENT OFFICE.

FREDERICK HACHMANN. OF ST. LOUIS,

MISSOURI, ASSIGNOR- OF ONE-HALF TO HERMAN STIEFEL, OF ST. LOUIS. MISSOURI, ONE-EIGHTH TO DAVID M. HUTCH- INSON, 0F FERGUSON, MISSOURI. AND ONE-SIXTEENTH T0 PHILIP E. MOODY.

ONE-SIXTEENT IO CHAUNCEY It. WATSON. AND ONE-SIXTEENTH T0 H. A.

WRIGHT, ALL 3F DETROIT. MICHIGAN.

PISTON-RING.

Specification of Letters Patent.

Patented Aug. 3. 1920.

To all whom, it may con ern:

lie it known that I. Fin-airmen I'IACII- MANN, a citizen oi the l nited States, and resident of St. Louis ind State of Missouri, have invented certain new and useful Im provements in Piston l ings. oi which the following is a specific tion containing a full, clear. and exact descri Jtion. reference being had to the accompan ing drawings, forming a part thereof.

This invention relates to improvements in piston rings and has for its object a piston ring composed of two sections and riveted together. thus forming practically a. solid ring. A further object is to make a piston ring of two sections which sections are riveted together in such a manner that the slit portions of the ring are not opposite each other and at the same time nonc oi the resiliency of the ring is lost. A further object is to provide a two piece ring, the parts of which may be cut from a long tube which has been turned and bored to the proper size. slitting these portions and then riveting the same together on .one side only, thus allowing free expansion and at the same time holding the rings tightly together.

In the drawings:

Figure 1 is a plan view of my ring complcted.

Fig. 2 is an edge view of the same.

Fig. 3 is an enlarged view of the ring showing points of riveting taken on the line I. 3 of Fig. 2.

Fig. 4 is a cross-sectional view taken on the line -'l4 of Fig. 1. 7

Fig. 5 is a cross-sectional View of one of the sections of the ring. showing the rivet. hore taken on the line 5-5 of Fig. 3.

Fig. 6 is a cross-sectional view of one of the sections of the ring showing "the rivet inserted in the rivet bore taken on the line r-o of Fig. 3.

Fig. 7 is a cross-sectional view of both parts of the r ng with the. rivet interposed between, before the rivet lliLS lflQl') set.

in carrying out my invention, I provide a piston ring 8 composed of two sections J and 10. each section being provided with a diagonal slot or open slpace 11.. On the inner face of each ring, form an opening 12. which is provided at its bottom end with an enlargement l3 and the upper portion with screw threads 14. In this opening 12 is placed a rivet is. which is of a size so as to lit easily within the opening 12. This rivet is composed of a material softer than the material out of which the ring is formed.

Each of thc,rings: is provided with two oi these openings. hoth openings being on the same half of the ring and approximately two inches apart. thus allowing expansion on the other parts of the ring. In each of these openings at rivet L3 is Plil(lll,tllt? length o'l' the rivet being slightly more than the combined depth of two opposite holes. This is clearly shown in Fig. 7. The ring is then placed in a press which may be either hydraulic. or operated in any other well known manner and when pressure is exerted on the two sections of the ring the rivet will swell and fill the threads 14 and the under-cut portion 13. thus securely locking the parts of the ring together and at the same time allowing it to retain its fu'l rcsiliency. By the use of my invention noth sections may he ground on all four surfaces and the same when secured together form practically a long lap one piece ring.

Having fully described my invention, what I claim is:

l. A piston ring composed of two independent and finished rings each of which is slitted and the slitted 0 ening of one ring being overlapped by the ody portion of the 0 her ring. the contacting faces of each ring hing provided with a bore passing par tially through the ring. and a soft metal rivet located in the bores for connecting said rings together, said rivetforming an invisible connection in the coin )leted ring.

2. A piston ring composer of two independent and finished rings. said. rings being slittcd and the slit of one ring overlying the liody of the other ring. horcs formed partially through the contacting faces of each ring, soft metal rivets located in said bores having their ends upset for drawing the rings together. said hores and rivets affording an invisible connection in the completed ring.

3. A piston ring composed of two finished slitteil rings the body portion of one ring spanning the slit in the other ring, bores im'nicd in the inner face of each ring extendin; partially through the ring, the bores in Hlt'll ring being vertically opposite the bores in the other ring, an uni er-cut portion located at the bottom of each bore, threads formed in the upper portion of each bore, a rivet of soft material inserted in the pair of bores and means for expanding the rivets into the under-cut and threaded portion of the bores for binding the ring securelytogether.

4. A piston ring composed of two independent finished sections slit soas to form a diagonal slot between the ends of each sec; tie-.2, each section being provided with e sz-rew threaded bore, which bores coincide when the sections are placed together, and said slots being so located, that the slot formed between the ends of one seetion will he overlapped by the body portion "of the other section, whereby the lapped portions of the ring are not reduced and the combined resiliency of both sections are practically preserved, and. e rivet seated in said bores.

In testimonyfwhereof, I have signed my name to thisspecification, in the presence of two subscribing witnesses.

FREDERICK HACHMANN.

Witnesses WALTER O. STEIN. 

